Enough letters can change the policy of a business in a very short time period.

足够的信能在很短的时间内改变他们的商业政策。

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If you have followed and unfollowed people in a short time period, particularly by automated means (aggressive follower churn)

在很短的时间内，特别是通过自动化方法(aggressive follower churn)来follow大量用户。

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Use whatever sound effects you like and a wide variety of voices, but don't let things get too complicated in such a short time period.

使用您喜欢的任何音效和各种不同的声音，但是不要在如此短的时间内把事情搞得太复杂。

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The progression of the country in such a short time period was mind boggling.

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An acute dose is a relatively large amount of radiation received in a very short time period.

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History has shown, however, that spikes in the incidence of meningococcal disease can occur over a short time period and without warning.

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